U.S. department of Energy reported on April 6, 2012, that radioactive particles of cesium and cobalt are being found on construction materials.

A contractor discovered the contamination.  Officials think it could be from the demolition of old buildings in that area of the INL site, which would imply that the buildings were contaminated before being torn down.

A local east Idaho DOE spokesman said there was no concern “…unless you get it onto your skin…” and you had “…prolonged exposure…”

Employees and vehicles are now being checked for contamination as they enter and leave the site.